Wrist-pin.



S. B. WELCOME.

WRIST PIN. APPLICATION FILED 111L 11, 1910.

Patented Au 23, 1910.

' iii 110.1 7%.- 66/6/22 77e'nw soLoN is. WELCOME, or LOS ANGELES,onmromqia WRIST-PIN.

Application filed January 11, 1910. Serial No. 537,556.

To all whom 'it my concerns I Be it known that I, SoLoN B. WELcoMn, acitizen of the United States, residing at I Los Angeles, in the countyof Los Angeles and State of California, have invented a new and usefulWrist-Pin, of which the following is a specification.

This invention relates to wrist pins.

One of the main objects of the invention is to provide a constructionof. wrist pin which when worn ma be turned up tr ie and replaced in theplston and the brasses set up, thus obviating the necessity for a new into replace one that is worn.

Ot er objects ofthe invention are to provide a wrist pin of economicalconstruction, which can be accurately positioned in the piston, andwhich can readily be tightened should it become loose, without requiringany re-fitting thereof.

A further object is to enable the wrist pin to be removed from thepiston without removing the piston from the cylinder, thereby enablingthe connecting rod to be more readily removed than heretofore.

In pistons which are drilled diametrically to receive the wrist pin, thepin frequently works endwise and coming in contact with the cylinderwalls scores them and necessitates reboring of the cylinders. In thepresent construction, there is a'solid wall of metal in the pistonaround the ends of the wrist pin so that the latter cannot possibly comein contact with the cylinder walls.

Other objects and advantages will be brought out in the followingdescription.

Referring to the drawings: Figure 1 is a longitudina l section thro ugha piston equipped with the wrist pin. Fig. 2 is a section on the line mm Fig. 1. Fig. 8 is a section on the line w w Fig. 1. Fig. at is anenlarged section on the line a:'*m* Fig. 1. Fig. 5 is a perspectivedetail of the wrist pin.

1 designates the wrist pin, each end of which is formed with flattenedfaces 2 and drilled at 3. Each end is also formed with a convex roundedsurface 4, concentric with the axis of the piston, the said curvedsurface being formed by turning the ends of the pin in a lathe.

5 designates the piston which is provided with ,two lugs 6 diametricallyopposite each other, each lug 6 being supported by two webs 7 whichextend toward the head 8 of the piston, The wrist pin 1 is secured tothe Specification of letters Patent. Patented Aug. 23, 19,10;

lugs 6, fiat faces 2 resting against, the faces of the lugs 6, as shownin Fig. 1.

The piston is formed witha shoulder 9 at the base of-each lug 6, whichshoulders, as. shown in Fig. 2,.are formed with concave faces concentricwiththe. axis of the piston which fit the rounded ends ,4 of the wrist.

pin. This method of construction not only afi'ords solid abutment forthe ends of the I Wrist pin, preventing it from shifting endwise, butalso serves to bring'the axis of the wrist pin into intersection withthe axis of i the piston. In other words, it brings the wrist. pin intoa diametric position Without requiring elaborate measurements.

Studs 10 are screwed in the lugs 6 and the holes 3 in the wrist pinslide freely over the studs to enable the wrist pin to be easily placedin position or removed. Nuts 11 are screwed on the studs against theouter' fiat faces 2 of the wrist pin and cotter pins 12 are inserted inthe ends of the studs to prevent the nuts 11 from accidentally turningoff the studs in the event that the nuts 11 become loose.

It will be observed that the wrist pin 1 is firmly held in place by thestuds 10 and nuts 11, and if a slight knock should develop by reason ofthe nuts 11 loosening, it is a very simple matter to tighten themWithout removing the piston from the cylinder, as access is had to thenuts through the open end of the piston. a simple matter to remove thenuts 11 to enable the wrist pin 1 to he slipped off the studs 10 when itis desired to remove the connecting rod or wrist pin.

What I claim is:

1. In combination, a piston provided with inwardly projecting lugs, awrist pin having flat faces on its ends fitting against said lugs, and.bolts passing through the wrist pin and fastening the wrist pin to saidlugs.

2. In combination, a piston provided with inwardly projecting lugs, awrist pin having flattened ends fitting against one side of said lugs,studs screwed into said lugs, the flat- For the same reason it is tencdends of the wrist pin having perforations which slidably fit over thesaid studs, and nuts on the studs andholding the flattened ends of thewrist pin against said lugs.

3. In combination, a piston provided with inwardly projecting lugs andformed with shoulders at the base of said lugs concentric with the axisof the-piston, a wrist pin hav ing rounded ends concentric with thepiston j which fit the said shoulders, the ends of the wrist pin havingflattened side faces which fit against the 'sldes. of said lugs,andscrew studs" onsaid lugs extending through said wrist pin, and nutson said studs detachably necuring the ends of the wrist pinto said u iIn combination a piston provided with inwardly projecting lugs andformed with shoulders at the base of said lugs concentric with the axisof the piston, a wrist pin having rounded ends concentric wit-h thepiston which fit the saidshoulders, the ends of the wrist pin havingflattened side faces which fit against the sides of said lugs, studsscrewed into the said lugs and projecting through perforations formed inthe ends of A pin may the wrist pin, and nut s'on' the ends of the studsholding the ends of the wrist pin against the lugs.

V 5. In combinatiomapiston provided with a pair of inwardly pin. withits ends resting against the sides pro ecting lugs, a wrist of said lugsopposite the head of the piston, and bolts the wrist in to said lugs,whereby the wrist e withdrawn from said lugs in a direction away fromthe head of the piston.

- In testimony whereof, I have hereunto set 'my hand at Los Angeles,California, this 27th day of December, 1909.

S. B. WELCOME.

In presence of G. T. HAoKLEY, FRANK L. A. GRAHAM.

detachably securing the ends of

